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Sampling Frequency

Six Sigma – iSixSigma Forums Old Forums General Sampling Frequency

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  • #41990

    Whitehurst
    Participant

    Hi,
    I just came across a formula to determine frequency while sampling
    the formla is  k = ( critical specification – process average ) / Sp
    where Sp = process variability
    now its a little bit complicated how we calculate Sp
    Sp = sqrt ( S ^ 2 pcl – S^2t)
    S^pcl = = MR bar / 1.128
    but i am not able to understand what is S^2t.
    Can some one explain me this formula. Its in the book six sigma and beyond vol 4  Chapter 7.
    Help please
    Regards
    joe
     

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    #132301

    Smith
    Member

    I also came thru this formula but no idea how to use it. Good to know if someone replies. Lets see what Mr Darth or Mr Stan has to say about it if they know the answer ofcourse
    Cheers
    Smith

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